[llvm] [SystemZ] Enable liveness reduction in pre-RA sched strategy. (PR #188823)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

Experimental options removed with new tests that work without them.

I also tried again if caching of computeRemLatency() would be meaningful, but it didn't seem to make any difference at all on either worst case or the average pass time (accross SPEC).


https://github.com/llvm/llvm-project/pull/188823